62results about How to "Mild and controllable reaction" patented technology

The invention discloses a method for preparing graphene by a low-temperature chemical reduction method, which belongs to the technical field of chemical composition of graphene. In the method, graphene oxide prepared by chemical oxidation is used as a raw material. The method comprises the reduction reaction step of reducing the graphene oxide into graphene; in the reduction reaction step, aluminum iodide is used as a reducer; the reduction of the graphene oxide is realized by controlling the concentration of the reducer and a solvent type at 60 DEG C to 180 DEG C; oxygen-containing functional groups (epoxy group, hydroxyl group, carboxyl group and carbonyl group) on the graphene oxide are removed; the electric conductivity of the graphene is recovered more thoroughly; and the graphene isprepared. The method provided by the invention is a method for preparing the graphene by a low-temperature chemical method, which is suitable for large-scale industrial production. The method has theadvantages of low reduction temperature, mild and controllable reaction, more thorough reduction, environmental-friendly performance, suitability to industrial production, etc.

The invention discloses cationic waterborne polyurethane and a preparation method thereof, and relates to the technical field of polyurethane. The problems that an existing cationic waterborne polyurethane preparation method is complex in technology, and prepared waterborne polyurethane emulsion cannot get rid of the dependency on petrochemical resources are solved. The structural formula of the cationic waterborne polyurethane is shown as a formula (1) (please see the formula in the description). The invention further provides a preparation method of cationic waterborne polyurethane resin. The preparation method comprises the steps that firstly, under protection of inert gas, poly(carbonic ester-ether)dihydric alcohol reacts with diisocyanate in organic solvent to obtain a first intermediate; secondly, the first intermediate reacts with a hydrophilic chain extender under action of a catalyst to obtain a second intermediate; lastly, the second intermediate reacts with butanediol, acid is added for neutralization, deionized water is added to remove the solvent through emulsifying and steaming, and then the cationic waterborne polyurethane resin is obtained. The polyurethane resin is excellent in performance, and waterborne polyurethane can reduce the dependency on the petrochemical resources.

The invention discloses a process for preparing graphene by a cryochemical method, belonging to the technical field of chemical synthesis of graphene. The process uses graphene oxide prepared by chemical oxidation as a raw material, and comprises the step of reducing reaction in which graphene oxide is reduced into graphene. The reducing reaction step implements reduction of the graphene oxide at80-150 DEG C by using sodium borohydride as a reducer by the aid of a catalyst, oxygen-containing functional groups (epoxy group, hydroxy group, carboxy group and carbonyl group) on the graphene oxide are removed, and the electric conductivity of the graphene is thoroughly recovered, thereby preparing the graphene. The process disclosed by the invention is suitable for large-scale industrial production. The process has the advantages of low reduction temperature, mild and controllable reaction, thorough reduction, environment friendliness and the like, and is suitable for industrial production.

The invention discloses a grafting reaction device and a use method thereof. The grafting reaction device comprises a weightlessness feeding device, a single-screw melting device, an aid adding device, a twin-screw grafting reaction device and a vacuum devolatilization device. The use method comprises steps as follows: 1) a premix is added to the single-screw melting device by the weightlessness feeding device; 2) the single-screw melting device plasticizes and melts the premix into polymer melt and introduces the polymer melt into the twin-screw grafting reaction device; 3) the aid adding device adds aids to one or two heating zones of the twin-screw grafting reaction device; a graft polymer is formed through a grafting reaction in the twin-screw grafting reaction device and then introduced into the vacuum devolatilization device; 4) a solvent and non-reacted grafting aids are removed from the vacuum devolatilization device, and a finished product is obtained. The reaction device can effectively reduce crosslinked byproducts in the melting graft process of the polymer.

The invention provides a low-cost preparation method of a sulfide solid electrolyte composed of Li, P and S elements and with freely controllable components. The preparation method comprises the following steps: adding elemental sulfur and phosphorus pentasulfide into an organic ether solution of a metal lithium-aromatic compound, and mixing to obtain a mixed solution; and sequentially carrying out mixing reaction, separation, precipitation, drying and heat treatment on the mixed solution to obtain the sulfide solid electrolyte containing Li, P and S as constituent elements. According to the preparation method of the sulfide solid electrolyte, raw materials are cheap and easy to obtain, the process is simple, production is safe, product components are easy to adjust, and production cost can be greatly reduced.

The invention relates to a preparation method of lansoprazole compounds, in particular to a one-pot preparation method of the lansoprazole compounds. By means of the preparation method, the process is easy and convenient, operation is simple, and the lansoprazole compounds are suitable for large-scale industrial production. Lansoprazole prepared through the method is high in total yield and content, and the quantity of related substances is low.

The invention relates to a method for producing aluminum-doped zinc oxide nano powder, and belongs to the technical field of the preparation of a nano material. The preparation method comprises the following technological processes: (1) preparing a solution from zinc nitrate, aluminum nitrate, amine organic matters and adjuvant according to certain proportions; (2) heating the solution, and carrying out reaction after the solution is volatilized and concentrated so as to obtain precursor powder; and (3) reacting the precursor powder in air within a temperature range of 400-800 DEG C for 1-5h so as to obtain the aluminum-doped zinc oxide nano powder. The preparation method disclosed by the invention is simple in process, low in cost and easy in industrialization; and the prepared aluminum-doped zinc oxide nano powder is fine in crystalline grain, good in dispersity and controllable in grain size, and the nano powder has a mesoporous structure and is applicable to the fields of organic pollutant adsorption and the like.

The invention discloses a wet treatment method of copper smelting acid-making acid mud. The wet treatment method comprises the following steps that acid-making acid mud is pulped, a chemical agent A and a chemical agent B are added for leaching after pulping, solid-liquid separation is carried out after leaching is finished to obtain leached residues and neutral leachate, and lead, gold and silverare recovered from the leached residues; a chemical agent C is added into the obtained leachate for reduction, the final reduction potential is controlled to be 300 mV-450 mV, and solid-liquid separation is carried out to obtain mercury-rich residues and a reduced solution; the pH value of the reduced solution is controlled to be less than 1, a chemical agent D is added for reduction, solid-liquid separation is carried out after the reaction is ended to obtain crude selenium and a selenium-precipitated solution, and the selenium-precipitated solution is conveyed to a water treatment procedureto recover copper; and water is added into the mercury-rich residues for pulping, a chemical agent E is added into the solution for reaction, solid-liquid separation is carried out after the reactionis ended, after solid is separated and dried, industrial mercury is obtained, liquid can be recycled, and periodic open-circuit treatment is carried out.

The invention discloses a method of preparing a high-activity photocatalyst zinc magnesium composite oxide for degradation of organic dyes. Mg(NO3)2.6H2O and Zn(NO3) 2.6H2O are weighed and dissolved in deionized water to get a solution A. Na2CO3 is weighed and dissolved in deionized water to get a solution B. The pH values of the solutions A and B are adjusted respectively. Then a Mg (NO3)2 solution is heated, a Na2CO3 solution is quickly added to the Mg(NO3)2 solution under vigorous stirring, and stirring is continuously conducted for 2.0-6.0 min. A white precipitate is obtained after standing and ageing, and flower-like aMgCO3.bZnCO3.cMg(OH)2.dZn(OH)2.eH2O is prepared after the white precipitate is subjected to filtration, washing and drying. The flower-like aMgCO3.bZnCO3.cMg(OH)2.dZn(OH)2.eH2O is roasted in a muff furnace, and finally a high-activity spherical zinc magnesium composite oxide Mg0.8Zn0.2O catalyst with a diameter of 36 [mu]m is obtained. The invention has the advantages that the preparation method is simple, raw materials are easy to obtain, and the prepared Mg0.8Zn0.2O catalyst has high activity and a high repeated utilization ratio. Under the irradiation of ultraviolet or visible light, the prepared catalyst has higher catalytic degradation activity for organic dyes in aqueous solutions and better degradation activity for organic dyes.

The invention provides a preparation method of tirofiban hydrochloride, which includes steps of: dissolving N-(n-butylsulfonyl)-O-[4-(4-piperidyl)butyl]-L-tyrosine in a diluted hydrochloric acid watersolution, decolorating the raw material with active charcoal, extractively eluting the raw material with ethyl acetate, dropwise adding a product solution to a hydrochloric acid solution, and regulating acidity with stirring to separate a crystal. The method is simple in processes, is stable in yield and is high in product purity, and is suitable for production and preparation of high-purity tirofiban hydrochloride used for preparations.

The invention discloses a preparation method for hemihydrate lorcaserin hydrochloride. The preparation method comprises the following steps: (1) making a compound shown as a formula III react with ammonia to obtain a compound shown as a formula II; (2) under the protection of nitrogen gas, dissolving the compound shown as the formula II in an organic solvent, adding a hydrogen chloride solution of which the solvent is the organic solvent to salify, and adding water and cyclohexane to form a hemihydrate in order to obtain the compound shown as a formula I, wherein the organic solvent is isopropanol or 1,4-dioxane. In the preparation method disclosed by the invention, ammonium hydroxide substitutes for potassium carbonate in the prior art, so that unqualified ignition residues of a finial product caused by potassium chloride generated after salt removal can be avoided; an isopropoxide hydrochloride solution substitutes for the conventional hydrogen chloride gas, so that other impurities can be prevented from being introduced in a preparation process under the improper control of dosage and rate of the gas.

The invention relates to the technical field of hyphantria cunea prevention and treatment, in particular to a synthetic method for synthesizing sex pheromone of hyphantria cunea. According to a traditional method for synthesizing (3Z,6Z,9S,10R)-9,10-epoxy-3,6-heneicosadiene by using propargyl alcohol as a starting material in the traditional technology, various side reactions are liable to occur during a sulfonic acid esterification reaction on a key intermediate (2S,3R)-2,3-epoxy-1-tetradecanol by using trifluoromethanesulfonic anhydride. In order to solve the problems, the (3Z,6Z,9S,10R)-9,10-epoxy-3,6-heneicosadiene is successfully synthesized by taking propargyl alcohol as an initial raw material and taking a Sharpless asymmetric dihydroxylation reaction as a key step without the step of the sulfonic acid esterification reaction on a key intermediate (2S,3R)-2,3-epoxy-1-tetradecanol by trifluoromethanesulfonic anhydride in the preparation process. Therefore, the whole reaction is mild and controllable and few in side reactions, and enantioselectivity is high.

The invention discloses a multi-key cooperative controllable method for promoting the stabilization of medium-low temperature asphalt. The method includes heating and mixing the medium-low temperatureasphalt and an accelerator uniformly in a high-pressure reaction kettle, cooling and discharging to obtain modified asphalt; placing a molding intermediate prepared from the modified asphalt in a tubular furnace, heating to 180-330 DEG C by heating 1-5 DEG C per minute, keeping the temperature for 0-5 hours, cooling and discharging to obtain a stabilized asphalt product; and carbonizing the stabilized product at 500-1500 DEG C to obtain an asphalt-based carbon product. The method has the advantages of simple operation process and low cost, solves the problems of difficult stabilization and poor controllability of medium-low temperature asphalt, promotes the high-value utilization of low-value raw materials, and is expected to be popularized industrially.

The invention discloses an electrochemical mineral leaching process. The electrochemical mineral leaching process comprises the following steps: (1) crushing an acid-soluble mineral to 100 to 300 meshes; (2) adding water of which the volume is 2 to 10 times the volume of the mineral to the mineral obtained in the step (1) to form slurry; (3) adding an electrolyte to the mineral slurry obtained inthe step (2); (4) inserting an anode plate and a cathode plate into the mineral slurry obtained in the step (3), and afterwards performing direct-current electrolysis for 2 to 12 hours at the voltageof 1 V to 15 V and at a current density of 1 A/m<2> to 300 A/m<2>; and (5) after electrolysis is ended, collecting elements which can be electrodeposited under an acidic condition by using the cathodeplate, and performing solid and liquid separation on the mineral slurry to obtain a material solution. According to the electrochemical mineral leaching process, salt electrolysis is used for replacing acid reaction to perform mineral leaching; the reaction is mild and controllable; the salt electrolysis effect is better than a direct acid solution effect; moreover the amount of salt-containing waste water can be greatly reduced; cyclic utilization is realized; and the electrochemical mineral leaching process disclosed by the invention is applicable to processing of various metal minerals, realizes comprehensive utilization of the minerals and is especially applicable to low-grade minerals.

The invention provides a method for continuously manufacturing potassium diformate. The method is characterized in that carbon dioxide gas serves as a regulating agent, formic acid and potassium hydroxide serve as raw materials, potassium diformate is synthesized in one step, and no gas is emitted in the whole reaction process. In the production process, solid potassium hydroxide is prepared into a solution, a certain quantity of the potassium hydroxide solution is obtained, and the carbon dioxide gas is introduced into the potassium hydroxide solution to prepare a potassium hydroxide and potassium carbonate mixed solution; potassium ions and formic acid with the molar ratio of 1:(2.0-3.0) are added in the mixed solution, and stirring reaction is conducted; in the reaction process, reaction temperature is kept to be 55-75 DEG C; the carbon dioxide gas generated due to reaction of formic acid and the mixed solution is recycled and reacts with a newly introduced potassium hydroxide solution; the product of the primary reaction is taken out, secondary reaction continues, reaction temperature is kept to be 55-75 DEG C, and secondary reaction lasts for 1-2.5 hours. The whole reaction is mild, controllable and free of emission, continuous production is achieved, and the method is suitable for large-scale industrial production.

The invention relates to the technical field of production of a nicosulfuron active compound, in particular to a method for circularly producing the nicosulfuron active compound by using a byproduct phenol. The method for circularly producing the nicosulfuron active compound by using the byproduct phenol comprises the following steps: reacting diphenyl carbonate with sulfonamide to generate a phenyl ester intermediate and a byproduct phenol; reacting phenyl ester with pyrimidinamine to generate nicosulfuron and a byproduct phenol; extracting and collecting phenol as a byproduct of the reaction in the two steps, and conducting reacting with solid light to obtain diphenyl carbonate; and subjecting the diphenyl carbonate obtained by the reaction to reaction with sulfonamide, and then producing phenol as a byproduct for next cyclic utilization. According to the method for circularly producing the nicosulfuron active compound by utilizing the byproduct phenol, provided by the invention, the reaction steps are mild and controllable, the process equipment is simple, the wastewater amount is small, the production cost is low, the product quality meets the requirements of high-end customers, a wastewater device of the byproduct phenol is omitted, the energy is saved, the production environment is improved, and the comprehensive utilization rate of resources is high.